Since Scamp is a kissin' cousin of the Boler (13' model), you might check with them. It's a bi-fold and sells for $195. There are four different configurations.. so you'd need to call with door opening size in hand. PLUS you need to have a frame for it. Click this link to see what I'm talking about: http://www.fiberglassrv.com/forums/f...bay-38172.html

On edit: If you're interested in making one, download the PDF in this post: Scamp Screen Door

To add to Donna's advice, I checked with Scamp for my Boler. From my convo, I was under the impression the frame would come with it - but I'm not certain that was correct. They estimated they were going to charge me $100-150 for shipping (it would be crated, and shipped as freight), and told me it'd need modifications to fit a Boler. They said it should be close, but likely wouldn't be exact. I'm opting to make my own - a few folks have helpfully posted their work.

Boler didn't offer a screen door but I found some instructions on the Bolerama forum that I used to make ours. After levelling the trailer front to back and side to side, I placed a 1x2 piese of wood vertically to mark the side pieces and made a cardboard template so that I could cut out the side frames. After talking to 'Gord 100' I screwed them into place from inside the cupboard so that the screws wouldn't show and through the door frames under the rubber moulding. You now have a square opening to which you can attach the door of your choice.